PDF malware analysis — malicious · f1a464f20cbf2a9f

MALICIOUS

PDF

5.6 KB Authoring application: Jidagelageno (via 31d84Ylojoppekaxopqi)

MD5: b4e36c9f1d641e1a8e97d9c6aaffb9df SHA-1: 70587e7385d5a4d5178169f866637ce85cd0bdb1 SHA-256: f1a464f20cbf2a9f48e26168e8eefe37d02680d5158f70ae9fc51e10fd934725

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, identified by heuristics as a stager. The JavaScript stream, named 'javascript_obj0008_000.js', is highly obfuscated, preventing a detailed analysis of its exact function. However, the presence of a stager suggests it is intended to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

Page-word XOR JavaScript eval stager high PDF_PAGE_WORD_XOR_EVAL_STAGER

PDF JavaScript enumerates rendered page words with getPageNthWord/getPageNumWords, extracts encoded byte fragments, XOR-decodes the stage with char-code helpers, and evals the result. This is an old exploit-kit staging pattern and is not normal document JavaScript.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0008_000.js` `c510f8c6a5031d17c6606a6a4e88ede1c3452bf51c2d06efb7ba03d3692fec56`	pdf-javascript-stream	PDF /JS object 8 at offset 0xF52	1346 bytes

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